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Operations and Significant Accounting Policies - Supplemental Statement of Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Supplemental Cash Flow Information [Abstract]      
Cash Paid During the Period for Interest - Net of Amounts Capitalized $ 47.5 $ 42.7 $ 43.2
Cash Paid (Received) During the Period for Income Taxes 0.5 [1] 0 [1] (11.4) [1]
Noncash Investing and Financing Activities [Abstract]      
Increase in Accounts Payable for Capital Additions to Property, Plant and Equipment 8.3 20.2 5.9
Increase (Decrease) in Capitalized Asset Retirement Costs (0.7) 17.1 0.3
AFUDC - Equity 4.6 5.1 2.5
ALLETE Common Stock Contributed to Pension Plan $ 0 $ 0 $ (20.0)
[1] Due to bonus depreciation provisions in 2010 and 2012 federal legislation, NOLs were generated which resulted in little or no estimated tax payments, and in 2011, refunds were received from NOL carrybacks against prior years’ taxable income.